Hello i am new to web2py i create a table in mysql db that need to have 3 
unique field:

   - ID_USER  
   - ID_GROUP 
   - ID_USER_ORGANIZATION

ID_USER and ID_GROUP are Unique keys of the table GROUPS
ID_USER is a Unique Keys of table USERS
ID_USER , ID_GROUP, ID_ORGANIZATION are Unique Keys for the table 
ORGANIZATION

I was trying to create a validation form with SQLFORM  using IS_NOT_IN_DB 
fuction but i dint' find a solution, i found lot of solution for 2 field 
check but not for 3. 

For the SQLFORM of the table GROUPS i didnt' got problems infact i wrote:

db.groups.id_group.requires = IS_NOT_IN_DB (db(db.users.id_user== 
request.vars.id_user),db.groups.id_group.)

Can someone help me posting just an example that i can try for the 
validation of the value of the ORGANIZATIONE TABLE?

Thank you

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